"""
1486. XOR Operation in an Array

Given an integer n and an integer start.

Define an array nums where nums[i] = start + 2*i (0-indexed) and n == nums.length.

Return the bitwise XOR of all elements of nums.


Example 1:

    Input: n = 5, start = 0
    Output: 8
    Explanation: Array nums is equal to [0, 2, 4, 6, 8] where (0 ^ 2 ^ 4 ^ 6 ^ 8) = 8.
    Where "^" corresponds to bitwise XOR operator.

Example 2:

    Input: n = 4, start = 3
    Output: 8
    Explanation: Array nums is equal to [3, 5, 7, 9] where (3 ^ 5 ^ 7 ^ 9) = 8.

Example 3:

    Input: n = 1, start = 7
    Output: 7

Example 4:

    Input: n = 10, start = 5
    Output: 2


Constraints:
    1 <= n <= 1000
    0 <= start <= 1000
    n == nums.length

"""


class Solution(object):
    def xorOperation(self, n, start):
        """
        :type n: int
        :type start: int
        :rtype: int
        """
        result = 0

        for i in range(n):
            result ^= (start + 2*i)

        return result


if __name__ == '__main__':
    print(Solution().xorOperation(10, 5))
    print(Solution().xorOperation(1, 7))
